Ichiro (増田一郎) Masuda
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Born : 1964
Cat. M60 Ultrarunner since 2011
15
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
33
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?Japan
Japan51,4%
Rank quotient ?This runner's calculation uses 15 eligible race(s): Σ(rank − 1) = 5 048; Σ finishers = 9 830. 5 048 / 9 830 × 100 = 51.35%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed15
Km — ultra races1 282 km
> 100 km3
> 160 km1
Longest race167,0 km
11th Ultra-Trail Mt. Fuji (UTMF) — 24/4/2026
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road36,2%
Trail63,8%
HISTORY
15 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 14.06 | 54km | 4th Around Toki River |
9:42:21 h | 60 |
| 24.04 | 167km | 11th Ultra-Trail Mt. Fuji |
44:50:52 h | 1388 |
| 2025 | ||||
| 20.09 | 80km | 11th SkyViewTrail Memorial Cup |
15:18:09 h | 87 |
| 2024 | ||||
| 16.11 | 100km | 10th FunTrails100K Round |
28:07:35 h | 243 |
| 13.10 | 71.5km | 32th Hasetsune Cup - Japan Mountain Endurance Race |
16:59:14 h | 766 |
| 22.09 | 75km | 2nd Mina no Tenku Ultra Marathon |
8:51:06 h | 30 |
| 14.07 | 109.2km | 16th OSJ Ontake 100km Ultra Trail |
15:31:14 h | 365 |
| 12.05 | 51km | 5th FunTrails Round Minano |
7:48:16 h | 108 |
| 2023 | ||||
| 08.10 | 65km | 16th Skyline Trail Sugadaira |
13:04:15 h | 37 |
| 2019 | ||||
| 25.08 | 70km | 6th Tsukuba Renjyo 70 km Road & Trail Run |
11:46:44 h | 114 |
| 19.05 | 100km | 25th Yatsugatake Nobeyama 100 km |
12:17:48 h | 493 |
| 2018 | ||||
| 22.04 | 118km | 28th Fuji 5 Lakes 118 km Challenge |
13:29:43 h | 147 |
| 2016 | ||||
| 24.04 | 100km | 26th Fuji 5 Lakes 100 km Challenge |
12:53:47 h | 733 |
| 2015 | ||||
| 19.04 | 71km | 25th Fuji 5 Lakes 71 km Challenge |
8:52:39 h | 250 |
| 2011 | ||||
| 02.10 | 50km | 1st SkyView Ultra-Trail |
10:36:59 h | 242 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 24/4/2026 | 11th Ultra-Trail Mt. Fuji (UTMF) | 167,00 | ×5 |
| ✓ 2 | 22/4/2018 | 28th Fuji 5 Lakes 118 km Challenge | 118,00 | ×3 |
| ✓ 3 | 14/7/2024 | 16th OSJ Ontake 100km Ultra Trail | 109,20 | ×3 |
| ✓ 4 | 16/11/2024 | 10th FunTrails100K Round | 100,00 | ×3 |
| ✓ 5 | 19/5/2019 | 25th Yatsugatake Nobeyama 100 km | 100,00 | ×3 |
| ✓ 6 | 24/4/2016 | 26th Fuji 5 Lakes 100 km Challenge | 100,00 | ×3 |
| ✓ 7 | 20/9/2025 | 11th SkyViewTrail Memorial Cup | 80,00 | ×2 |
| ✓ 8 | 22/9/2024 | 2nd Mina no Tenku Ultra Marathon | 75,00 | ×2 |
| ✓ 9 | 13/10/2024 | 32th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×2 |
| ✓ 10 | 19/4/2015 | 25th Fuji 5 Lakes 71 km Challenge | 71,00 | ×2 |
| ✓ 11 | 25/8/2019 | 6th Tsukuba Renjyo 70 km Road & Trail Run | 70,00 | ×2 |
| ✓ 12 | 8/10/2023 | 16th Skyline Trail Sugadaira | 65,00 | ×1 |
| ✓ 13 | 14/6/2026 | 4th Around Toki River | 54,00 | ×1 |
| ✓ 14 | 12/5/2024 | 5th FunTrails Round Minano | 51,00 | ×1 |
| ✓ 15 | 2/10/2011 | 1st SkyView Ultra-Trail | 50,00 | ×1 |